lily/volta-spanner.cc

   1 /*
   2   volta-spanner.cc -- implement Volta_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include <string.h>
  10
  11 #include "box.hh"
  12 #include "debug.hh"
  13 #include "font-interface.hh"
  14 #include "molecule.hh"
  15 #include "paper-column.hh"
  16 #include "paper-def.hh"
  17 #include "text-item.hh"
  18 #include "volta-spanner.hh"
  19 #include "group-interface.hh"
  20 #include "side-position-interface.hh"
  21 #include "directional-element-interface.hh"
  22
  23
  24 void
  25 Volta_spanner::set_interface (Grob*)
  26 {
  27 }
  28
  29 /*
  30   this is too complicated. Yet another version of side-positioning,
  31   badly implemented.
  32
  33   --
  34
  35   * Should look for system_start_delim to find left edge of staff.
  36
  37 */
  38
  39 MAKE_SCHEME_CALLBACK (Volta_spanner,brew_molecule,1);
  40 SCM
  41 Volta_spanner::brew_molecule (SCM smob)
  42 {
  43   Grob *me = unsmob_grob (smob);
  44   Link_array<Item> bar_arr
  45     = Pointer_group_interface__extract_elements (me, (Item*)0, "bars");
  46
  47   if (!bar_arr.size ())
  48     return SCM_EOL;
  49
  50   Spanner *orig_span =  dynamic_cast<Spanner*> (me->original_l_);
  51
  52   bool first_bracket = orig_span && (orig_span->broken_into_l_arr_[0] == (Spanner*)me);
  53
  54   bool last_bracket = orig_span && (orig_span->broken_into_l_arr_.top () == (Spanner*)me);
  55
  56   bool no_vertical_start = orig_span && !first_bracket;
  57   bool no_vertical_end = orig_span && !last_bracket;
  58   SCM bars = me->get_grob_property ("bars");
  59   Grob * endbar =   unsmob_grob (gh_car (bars));
  60   SCM glyph = endbar->get_grob_property("glyph");
  61   String str = ly_scm2string(glyph);
  62   const char* cs = str.ch_C();
  63   no_vertical_end |=
  64     (strcmp(cs,":|")!=0 && strcmp(cs,"|:")!=0 && strcmp(cs,"|.")!=0
  65      && strcmp(cs,":|:")!=0 && strcmp(cs,".|")!=0);
  66
  67   Real staff_thick = me->paper_l ()->get_var ("stafflinethickness");
  68   Real half_space = 0.5;
  69
  70   Item * bound = dynamic_cast<Spanner*> (me)->get_bound (LEFT);
  71
  72   /*
  73     not a start, but really broken in two
  74    */
  75   Real left =0.;
  76   if (bound->break_status_dir () == RIGHT)
  77   {
  78     Paper_column *pc = bound->column_l ();
  79     left = pc->extent (pc, X_AXIS)[RIGHT]   - bound->relative_coordinate (pc, X_AXIS);
  80   }
  81   else
  82   {
  83     /*
  84       the volta spanner is attached to the bar-line, which is moved
  85       to the right. We don't need to compensate for the left edge.
  86     */
  87   }
  88
  89   Real w = dynamic_cast<Spanner*> (me)->spanner_length () - left - half_space;
  90   Real h =  gh_scm2double (me->get_grob_property ("height"));
  91   Real t =  staff_thick * gh_scm2double (me->get_grob_property ("thickness"));
  92
  93   /*
  94     ugh: should build from line segments.
  95    */
  96   SCM at = (gh_list (ly_symbol2scm ("volta"),
  97                      gh_double2scm (h),
  98                      gh_double2scm (w),
  99                      gh_double2scm (t),
 100                      gh_int2scm (no_vertical_start),
 101                      gh_int2scm (no_vertical_end),
 102                      SCM_UNDEFINED));
 103
 104   Box b (Interval (0, w), Interval (0, h));
 105   Molecule mol (b, at);
 106   SCM text = me->get_grob_property ("text");
 107   SCM properties = gh_list (me->mutable_property_alist_, me->immutable_property_alist_,SCM_UNDEFINED);
 108   Molecule num = Text_item::text2molecule (me, text, properties);
 109
 110   mol.add_at_edge (X_AXIS, LEFT, num, - num.extent (X_AXIS).length ()
 111                    - 1.0);
 112   mol.translate_axis (left, X_AXIS);
 113   return mol.smobbed_copy ();
 114 }
 115
 116
 117 void
 118 Volta_spanner::add_bar (Grob *me, Item* b)
 119 {
 120   Pointer_group_interface::add_element (me, "bars",b);
 121   Side_position_interface::add_support (me,b);
 122   add_bound_item (dynamic_cast<Spanner*> (me), b);
 123 }
 124
 125 void
 126 Volta_spanner::add_column (Grob*me, Grob* c)
 127 {
 128   Side_position_interface::add_support (me,c);
 129 }